Mitsubishi Grandis. Manual — part 701

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-55

STEP 15. Connector check: B-15X engine control
relay connector and C-110 engine-ECU <M/T>
connector or engine-A/T-ECU <A/T> connector.

Q: Is the check result normal?

YES :

Go to Step 16 .

NO :

Repair or replace.

STEP 16. Check harness between B-15X engine
control relay connector and injector connector.

a. Check intermediate connector C-116, and repair

if necessary. If intermediate connector isnormal,
check harness between B-15X (terminal No. 1)
engine control relay connector and B-101
(terminal No. 1) No. 1 injector connector.

b. Check intermediate connector C-116, and repair

if necessary. If intermediate connector isnormal,
check harness between B-15X (terminal No. 1)
engine control relay connector and B-102
(terminal No. 1) No. 2 injector connector.

c. Check intermediate connector C-116, and repair

if necessary. If intermediate connector isnormal,
check harness between B-15X (terminal No. 1)
engine control relay connector and B-104
(terminal No. 1) No. 3 injector connector.

d. Check intermediate connector C-116, and repair

if necessary. If intermediate connector isnormal,
check harness between B-15X (terminal No. 1)
engine control relay connector and B-105
(terminal No. 1) No. 4 injector connector.

NOTE: Before checking harness, check intermediate

connector C-116, and repair if necessary.

• Check power supply line for damage.

Q: Are the check results normal?

YES :

Go to Step 17 .

NO :

Repair.

AK300967

2

1

3

4

AC

Harness side
connector

B-15X

Connector: B-15X

Relay box’s
triangle marks

AK305618AB

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

Connector: C-110

<L.H. drive vehicles>

<R.H. drive vehicles>

C-110 (GR)

C-110 (GR)

Harness side connector

AK300967

2

1

3

4

AC

Harness side
connector

B-15X

Connector: B-15X

Relay box’s
triangle marks

AK300978

M

1

2

AG

Harness side connector

Connectors: B-101, B-102, B-104, B-105

B-101 (GR) B-102 (GR)

B-105 (GR)

B-104 (GR)

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-56

STEP 17. Check harness between injector
connector and C-110 engine-ECU connector.

a. Check harness between B-101 (terminal No. 2)

No. 1 injector connector and C-110 (terminal No.
1) engine-ECU <M/T> connector or
engine-A/T-ECU <A/T> connector.

b. Check harness between B-102 (terminal No. 2)

No. 2 injector connector and C-110 (terminal No.
5) engine-ECU <M/T> connector or
engine-A/T-ECU <A/T> connector.

c. Check harness between B-104 (terminal No. 2)

No. 3 injector connector and C-110 (terminal No.
14) engine-ECU <M/T> connector or
engine-A/T-ECU <A/T> connector.

d. Check harness between B-105 (terminal No. 2)

No. 4 injector connector and C-110 (terminal No.
21) engine-ECU <M/T> connector or
engine-A/T-ECU <A/T> connector.

• Check output line for damage.

Q: Are the check results normal?

YES :

Go to Step 18 .

NO :

Repair.

STEP 18. Fuel pressure measurement.

• Fuel pressure measurement (Refer to Fuel

Pressure Test

P.13A-383

).

Q: Is the check result normal?

YES :

Repair.

NO :

Replace engine-ECU <M/T> or
engine-A/T-ECU <A/T>.

AK300978

M

1

2

AG

Harness side connector

Connectors: B-101, B-102, B-104, B-105

B-101 (GR) B-102 (GR)

B-105 (GR)

B-104 (GR)

AK305618AB

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

Connector: C-110

<L.H. drive vehicles>

<R.H. drive vehicles>

C-110 (GR)

C-110 (GR)

Harness side connector

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-57

Code No. P0130: Cylinder 1, 4 Oxygen Sensor (Front) System

OPERATION

• The sensor signal is inputted to the engine-ECU

<M/T> or engine-A/T-ECU <A/T> (terminal No.
109) from the cylinder 1, 4 oxygen sensor (front)
output terminal (terminal No. 4).

• The cylinder 1, 4 oxygen sensor (front) (terminal

No. 2) is earthed with engine-ECU <M/T> or
engine-A/T-ECU <A/T> (terminal No. 96).

FUNCTION

• The cylinder 1, 4 oxygen sensor (front) converts

the concentration of oxygen in the exhaust
emission into a voltage and inputs the signal to
the engine-ECU <M/T> or engine-A/T-ECU
<A/T>.

• When the air-fuel ratio is richer than the

theoretical air-fuel ratio, the cylinder 1, 4 oxygen
sensor (front) outputs a voltage of about 1 V.
When it is leaner than the theoretical air-fuel
ratio, it outputs a voltage of about 0 V.

AK305551

9192

939495

96979899

100

105

113114

115116117

118119120

106

107108109

110111112

101102103

104

1

2

3

4

Cylinder 1, 4 oxygen
sensor (front)

AB

Cylinder 1, 4 oxygen sensor circuit (front)

Engine-ECU <M/T> or
engine-A/T-ECU <A/T>

6

B

L

P

From engine control relay

1

2

3

4

96

109

B-22
MU802665

C-113

(MU803805)

Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet

To engine-ECU <M/T> or
engine-A/T-ECU <A/T>

C-115

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-58

• In response to the signal, the engine-ECU <M/T>

or engine-A/T-ECU <A/T> controls the fuel
injection amount so that the air-fuel ratio can be
equivalent to the theoretical air-fuel ratio.

TROUBLE JUDGMENT

Check Conditions

• Above 3 minutes later after the engine has

started up.

• The engine coolant temperature is approx. 82°C

or higher.

• The engine speed is 1200 r/min or more.

• The monitoring time is 5 seconds.

Judgment Criteria

• When the cylinder 1, 4 oxygen sensor (front)

output voltage is 0.2 V or less and a power
voltage of 5 V is applied to the cylinder 1, 4
oxygen sensor (front) in the engine-ECU <M/T>
or engine-A/T-ECU <A/T>, the sensor output
voltage is 4.5V or more.

• To be monitored once per driving cycle.

Check Conditions

• The engine speed is 1200 − 3000 r/min.

• The engine coolant temperature is approx. 60°C

or higher.

• Volumetric efficiency is 20 − 60 %.

• During the air-fuel ratio feedback control

Judgment Criterion

• When the cylinder 1, 4 oxygen sensor (front)

output frequency is 6 or less for 10 seconds on
the average.

PROBABLE CAUSE

• Failed cylinder 1, 4 oxygen sensor (front)

• Open/short circuit in cylinder 1, 4 oxygen sensor

(front) heater circuit or loose connector contact

• Failed engine-ECU <M/T>

• Failed engine-A/T-ECU <A/T>

DIAGNOSIS PROCEDURE

STEP 1. MUT-III data list

• Refer to Data List Reference Table

P.13A-363

.

a. Item 11: Cylinder 1, 4 oxygen sensor (front)

Q: Is the check result normal?

YES :

Intermittent malfunction (Refer to GROUP

00

− How to Use

Troubleshooting/Inspection Service Points

P.00-5

).

NO :

Go to Step 2 .

STEP 2. Connector check: B-22 cylinder 1, 4
oxygen sensor (front) connector

Q: Is the check result normal?

YES :

Go to Step 3 .

NO :

Repair or replace.

STEP 3. Perform resistance measurement at B-22
cylinder 1, 4 oxygen sensor (front) connector.

• Disconnect connector, and measure at harness

side.

• Resistance between terminal No. 2 and earth.

OK: 2

Ω or less

Q: Is the check result normal?

YES :

Go to Step 7 .

NO :

Go to Step 4 .

AK300973

1

2

3

4

AB

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B-24 (

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Harness side
connector

B-22 (GR)

Connector: B-22

Cylinder 1, 4 oxygen
sensor (front)

AC

AK300973

1

2

3

4

AB

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B-24 (

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ƒRƒlƒNƒ^![: B-24

Harness side
connector

B-22 (GR)

Connector: B-22

Cylinder 1, 4 oxygen
sensor (front)

AC